TD-SCDMA/WLAN异构无线网络固定迟滞与自适应迟滞切换研究

Research on switching of fixed hysteresis and adaptive hysteresis in the TD-SCDMA/WLAN heterogeneous wireless network

随着TD移动用户对无线宽带数据业务需求的急剧增加,将TD移动网络和WLAN无线局域网进行融合已成为TD运营商急需解决的问题。TD移动网络与WLAN无线局域网络融合的目的是为了发挥不同无线网络的优势,弥补各自网络的不足,从而优化无线网络通信性能、降低用户无线通信成本。TD移动网络与WLAN无线局域网络两种异构无线网络间切换可采用基于固定迟滞垂直切换和基于自适应迟滞垂直切换,通过模拟仿真比较发现:基于自适应迟滞垂直切换较基于固定迟滞垂直切换有较低的切换率、较低的乒乓切换率、较高平均流量。

With the TD mobile users＇ sharp increase in demanding for wireless broadband data services, the TD mobile network and WLAN wireless LAN fusion has become the urgent problem of TD operators. The network integration is to play the advantages of different wireless networks, make up for the inadequacy of the networks so as to optimize the wireless network communication performance and reduce the cost of wireless communication. The switching of TD-SCDMA/WLAN heterogeneous wireless networks can use the vertical handoff based on fixed hysteresis or adaptive hysteresis. Through simulation comparison, it is found that the vertical handoffbased on adaptive hysteresis has lower switching rate and ping-pong switching rate and higher average flow rate.